73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
// Copyright 2014 The Cayley Authors. All rights reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package db
|
|
|
|
import (
|
|
"os"
|
|
|
|
"github.com/barakmich/glog"
|
|
|
|
"github.com/google/cayley/config"
|
|
"github.com/google/cayley/graph"
|
|
"github.com/google/cayley/nquads"
|
|
)
|
|
|
|
type bulkLoadable interface {
|
|
// BulkLoad loads Triples from a channel in bulk to the TripleStore. It
|
|
// returns false if bulk loading is not possible (i.e. if you cannot load
|
|
// in bulk to a non-empty database, and the current database is non-empty)
|
|
BulkLoad(chan *graph.Triple) bool
|
|
}
|
|
|
|
func Load(ts graph.TripleStore, cfg *config.Config, triplePath string) {
|
|
tChan := make(chan *graph.Triple)
|
|
go ReadTriplesFromFile(tChan, triplePath)
|
|
|
|
bulker, canBulk := ts.(bulkLoadable)
|
|
if canBulk && bulker.BulkLoad(tChan) {
|
|
return
|
|
}
|
|
|
|
LoadTriplesInto(tChan, ts, cfg.LoadSize)
|
|
}
|
|
|
|
func ReadTriplesFromFile(c chan *graph.Triple, tripleFile string) {
|
|
f, err := os.Open(tripleFile)
|
|
if err != nil {
|
|
glog.Fatalln("Couldn't open file", tripleFile)
|
|
}
|
|
|
|
defer func() {
|
|
if err := f.Close(); err != nil {
|
|
glog.Fatalln(err)
|
|
}
|
|
}()
|
|
|
|
nquads.ReadNQuadsFromReader(c, f)
|
|
}
|
|
|
|
func LoadTriplesInto(tChan chan *graph.Triple, ts graph.TripleStore, loadSize int) {
|
|
tripleblock := make([]*graph.Triple, loadSize)
|
|
i := 0
|
|
for t := range tChan {
|
|
tripleblock[i] = t
|
|
i++
|
|
if i == loadSize {
|
|
ts.AddTripleSet(tripleblock)
|
|
i = 0
|
|
}
|
|
}
|
|
ts.AddTripleSet(tripleblock[0:i])
|
|
}
|